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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc1e562477e11eb3e0e0d3adad193ef4c5258d85dc62b87806359082a50aab0' 
  AND token = 'aOxFoFvYAHuA5TJfHt39B/HIcq5nqpKpPke2IyYtyn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}